I'm not a huge fan of library management software like Calibre, but have to agree with other posters: it does eliminate a lot of headaches when you have a large library. Updating to the latest firmware releases prior to asking for help related to a bug is also advisable. Kobo doesn't publicly document it's bugs or bug fixes, so it's very difficult for people on forums to offer assistance unless we're running the same firmware and can reproduce the problem as well as test potential fixes.